1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Copyright (c) 2014 Google, Inc
4 */
5
6 #ifndef __I2C_EEPROM
7 #define __I2C_EEPROM
8
9 #include <linux/errno.h>
10 #include <linux/types.h>
11
12 struct udevice;
13
14 struct i2c_eeprom_ops {
15 int (*read)(struct udevice *dev, int offset, uint8_t *buf, int size);
16 int (*write)(struct udevice *dev, int offset, const uint8_t *buf,
17 int size);
18 int (*size)(struct udevice *dev);
19 };
20
21 struct i2c_eeprom {
22 /* The EEPROM's page size in byte */
23 unsigned long pagesize;
24 /* The EEPROM's capacity in bytes */
25 unsigned long size;
26 };
27
28 #if CONFIG_IS_ENABLED(I2C_EEPROM)
29 /*
30 * i2c_eeprom_read() - read bytes from an I2C EEPROM chip
31 *
32 * @dev: Chip to read from
33 * @offset: Offset within chip to start reading
34 * @buf: Place to put data
35 * @size: Number of bytes to read
36 *
37 * Return: 0 on success, -ve on failure
38 */
39 int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf, int size);
40
41 /*
42 * i2c_eeprom_write() - write bytes to an I2C EEPROM chip
43 *
44 * @dev: Chip to write to
45 * @offset: Offset within chip to start writing
46 * @buf: Buffer containing data to write
47 * @size: Number of bytes to write
48 *
49 * Return: 0 on success, -ve on failure
50 */
51 int i2c_eeprom_write(struct udevice *dev, int offset, const uint8_t *buf,
52 int size);
53
54 /*
55 * i2c_eeprom_size() - get size of I2C EEPROM chip
56 *
57 * @dev: Chip to query
58 *
59 * Return: +ve size in bytes on success, -ve on failure
60 */
61 int i2c_eeprom_size(struct udevice *dev);
62
63 #else /* !I2C_EEPROM */
64
i2c_eeprom_read(struct udevice * dev,int offset,uint8_t * buf,int size)65 static inline int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf,
66 int size)
67 {
68 return -ENOSYS;
69 }
70
i2c_eeprom_write(struct udevice * dev,int offset,const uint8_t * buf,int size)71 static inline int i2c_eeprom_write(struct udevice *dev, int offset,
72 const uint8_t *buf, int size)
73 {
74 return -ENOSYS;
75 }
76
i2c_eeprom_size(struct udevice * dev)77 static inline int i2c_eeprom_size(struct udevice *dev)
78 {
79 return -ENOSYS;
80 }
81
82 #endif /* I2C_EEPROM */
83
84 #endif
85